| 摘要 |
PURPOSE: A method for molding a thin molded product is provided to relieve the lopsided pressure distribution of molten resin generated in a cavity for a compressing process by extracting the pressure in a mold and to mold the thin molded product with high degree of precision. CONSTITUTION: A method for molding a thin molded product comprises: a step of injecting molten resin in a cavity of a mold by driving a screw or a plunger to the shaft direction while opening the mold in a predetermined size(S3); a step of compressing the molten resin injected by closing the mold(S4); a step of lowering the pressure of the molten resin inside the cavity by retreating the screw or the plunger for the predetermined time while compressing(S6); and a step of applying predetermined pressure to the molten resin by adding a driving force to the screw or the plunger after extracting the pressure(S8). [Reference numerals] (AA) Start; (BB) End; (S1) Measuring process; (S2) Close a mold to be slightly opened; (S3) Start an injection process; (S4) Start a compressing process; (S5) Finish the injection process(Reaching a pressure-holding conversion position); (S6) Pressure releasing process, Forcibly retreat a screw by; (S7) Finish the compressing process; (S8) Pressure-holding process |
